Eating a higher protein diet is important during weight loss in order to try and preserve as much muscle as possible while cutting fat. Keep in mind I said DURING weight loss, not FOR weight loss. You will still require a caloric deficit during a a cut. There is always the option of a high FAT high protein diet for weight loss (KETOGENICS), however there is research suggesting that a keto diet inhibits Mtor and may be detrimental to muscle growth. To sum up: yes, if you are losing weight you should adjust your diet so that a higher percentage of your caloric intake is coming from protein to preserve muscle. However, simply eating protein alone will not directly cause weight loss on its own.